Chapter 3
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3-1
Stringline Setup
Sonic Stringline provides an inexpensive, easy to set up, continuous
reference that takes the best advantage of the non-contacting feature
of the Sonic Tracker II™. Stringline takes a few minutes to setup,
and becomes a constant grade reference. The stringline also
becomes a visual reference for the job, allowing any mistakes in a
hub elevation to be quickly spotted by sighting down the string.
Sonic stringline is both a reference and an averaging solution.
• As a reference, surface and elevated stringline provides
consistent results for level and sloped surfaces.
• As an averaging solution, surface stringline takes the place of
averaging skis.
The sonic stringline setup consists of readily available materials and
up to 500 feet of nylon stringline. Topcon’s Sonic Tracker II works
with many sizes and types of stringline, for best results use an 1/8
inch diameter nylon stringline.
NOTICE
NOTICE
Using steel wire or a plastic coated stringline
with a smooth surface can provide erroneous
results.
For a review of how the Sonic Tracker II works, see “Sonic
Control” on page 2-1. If the Sonic Tracker tracks the ground but not
a 1/8 inch diameter stringline, clean or replace the transducer. See
Chapter 7 for this procedure.
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